| 摘要 |
A half-mask of respirator is made of air-proof elastic material and equipped with several sites for the attachment of the cartridges for purifying the air and the fastening appliance for their fixation. With the aim of the reliable fixation, each site for the cartridge is equipped with the annular ledge for the fixation of the cartridges. The annular fixator is capable of being locked at the annular ledge of the half-mask. |
